Zenbot gets home switches

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Last week I added X and Y home switches to the zenbot. Here
are some photos. I need to better organize all those wires!

The X and Z axis have relatively sane places to put the switch, but the Y axis
provided a little bit of a puzzle. The solution was to cut a notch in the
Y-axis gantry so that the switch would fit in the narrow space between the
gantry and the box that forms the base of the machine.

I notice that in the newest zenbot machines, the left and right sides of the
box are gone, with the front and back pieces held in place by the machine
table. Maybe I could have done that on my zenbot as well, if I'd thought of it
in time.

I intend to also add a Z-axis home switch, but for now the tool length sensor
is far more useful.

The home switches are repeatable to under 1/1000 of an inch, which is plenty
good for cheap microswitches. I probably should remove the lever from the X
axis switch, but not before I do some comparisons to see whether it actually
makes a difference.